Reduced-Voltage Autotransformer Starter Performance Misunderstood
Dec 1, 1999, By EC&M Staff
The author of the article “Reduced-Voltage Starters: Choosing The Best Type For Your Application” (June 1998 issue) made an error with the following excerpt,...
How to perform short-circuit calculations, part 2.
Dec 1, 1999, Mercede, Frank J.
Performing short-circuit calculations requires an understanding of various system components and their interaction.In Part 1 of this article, which was...
Unconventional Transformer Connections — Part 2
Dec 1, 1999, By Scott Falke, Turlock, Calif.
Part 1 showed us how to use unconventional transformer configurations to resolve equipment availability problems and unusual circumstances. Part 2 provides more examples, and a look at the tradeoffs involved. Let's begin with Case Five....
Flywheel technology improves power quality at Ohio power company
Nov 1, 1999, By EC&M Staff
When American Electric Power (AEP), Columbus, Ohio, designed its new energy delivery headquarters, power quality was at the top of its list of concerns....
Using Arc-Fault Circuit Interrupters To Reduce Residential Fires
Nov 1, 1999, George D. Gregory
Possibly coming soon to an electrical distributor near you is the arc-fault circuit interrupter (AFCI). Although they may seem like just another new industry...
Can four 5kVA buck-boost transformers supply a 20kVA load?
Oct 1, 1999, Lawrie, Robert J.
Q Can I connect four 5kVA buck-boost transformers in parallel to supply a 20kVA load? - L.J.F.A Four 5kVA buck-boost transformers can be connected in...
Unconventional Transformer Connections — Part 1
Oct 1, 1999, By Scott Falke
Sometimes, budget constraints keep you from buying a new transformer for a specific application. You already have a boneyard of transformers; can you make do with what you have? In many cases, the answer is yes....
Don't Be Left Short by Current Transformers
Oct 1, 1999, By C. Sankaran, P.E.
Don’t get fooled by current transformer ratings and applications....
The Power of Design/Build: Teamwork Fuels Success
Oct 1, 1999, David Mozur, P.E.
Although there is a variety of design and construction project delivery methods for owners to choose from, design/build continues to grow in popularity....
Wound-Rotor Motors — High Torque and Adjustable Speed
Sep 1, 1999, By Robert J. Lawrie, Senior Editorial Consultant
Wound-rotor motors deliver speed control of heavy and high-torque loads....
Sealed Fittings: Why Are They Necessary?
Sep 1, 1999, By Charlie Wade, Appleton Electric Co.
With lives and property at stake in a hazardous location, it's important you use only the highest quality sealing fittings from reputable manufacturers. A classified area is not the place to cut corners....
Design E Motor: You May Have Problems
Sep 1, 1999, By John DeDad, Editor-in-Chief
You must compare torque characteristics and current values to ensure the Design E can do the job without requiring a higher-horsepower rating or a costly motor control upgrade....
Ten Tips for Proper Motor Selection
Sep 1, 1999, By Mark Lamendola, Technical Editor
You know how to match your motor to your supply voltage. What you may not know are the many other criteria for selecting a motor that will perform well over a long life....
Superconducting Transformer (HTS) Successfully Tested
Aug 1, 1999, By EC&M Staff
Is this experimental unit the most powerful superconducting transformer constructed to date? It’s already bringing sweeping changes to transformer and substation design....
Using single-phase transformers to create 3-phase systems.
Aug 1, 1999, DeDad, John A.
Many older industrial facilities use single-phase, oil-filled transformers made for pole-mounting but installed at ground level to create 3-phase power...
